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How to Grow Swizzle Zinnia from Seed: Cherry & Ivory Cut Flowers
Swizzle Cherry & Ivory zinnia grows into a tidy, compact plant 12 to 14 inches tall that is smothered in enormous double blooms through fall, summer. Each flower is a study in contrast: layers of cherry red frosted with white at the petal tips and finished with a fine crimson outline — the garden’s equivalent of fireworks on a stem.
Zinnias are some of the easiest cut flowers you can grow from seed, and this dwarf Swizzle series makes them even more foolproof. The one thing that can trip you up is mildew, so the watering advice below is worth remembering.
At a Glance
| BOTANICAL NAME | Zinnia elegans |
|---|---|
| LIFE CYCLE | Annual |
| LIGHT REQUIREMENT | Full Sun |
| PLANT HEIGHT | 12 to 14 inches |
| PLANT SPACING | 8 to 10 inches |
| BLOOM SEASON | Fall, Summer |
| PLANTING SEASON | Spring, Summer |
| SOWING METHOD | Direct Sow, Start Indoors |
When to plant
Zinnias are tender annuals. Direct sow after all danger of frost, once daytime temps reach at least 50–60°F. In cooler climates, start indoors 4–6 weeks before your last frost date instead.
Where to plant
Full sun and well-drained soil. Work in two or three inches of compost before planting to improve fertility and drainage — good drainage is your best mildew defense.
How to sow
Sow seeds about ¼–½ inch deep; seedlings appear in as little as 4–7 days in warmth. Once they are about three inches tall, thin to 8 to 10 inches apart so air can move between the plants and keep the foliage dry.
Ongoing Care
The golden rule with zinnias: keep the leaves dry. Water at the base of the plant and let the soil dry out between waterings, since wet foliage is how powdery mildew takes hold. Good spacing and airflow are your friends.
That is about all they ask. Deadhead spent blooms and they keep producing through the season — and the more you cut them for vases, the more they bloom. They perform equally well packed into a border or a container with a loose, well-draining mix.
Common Problems & Quick Fixes
- White powdery coating on leaves — powdery mildew. Water at the base, never overhead, and keep plants spaced for airflow.
- Leggy, few flowers — too much shade or too much nitrogen. Move to full sun and ease off fertilizer.
- Damping off when starting indoors — use sterile mix, water from below, and remove the humidity dome once seeds germinate.
FAQ
How big do Swizzle zinnia flowers get?
Three to four inches across — impressive double blooms on a plant that stays compact at 12 to 14 inches.
Are zinnias good cut flowers?
Excellent. They hold for over a week in a vase, and cutting them encourages even more blooms.
Why are my zinnia leaves turning white?
That is powdery mildew. Water at the base rather than overhead and space plants for airflow to prevent it.
